/// <summary>
/// Returns a random DELETE command
/// </summary>
public DbCommand GetDeleteCommand(Random rnd, TableMetadata table, DataStressConnection conn)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append("DELETE FROM \"");
List <TableColumn> columns = table.Columns;
string pName = GetParameterName("P0");
cmdText.Append(table.TableName);
cmdText.Append("\" WHERE PrimaryKey = ");
cmdText.Append(pName);
DbParameter param = DbFactory.CreateParameter();
param.ParameterName = pName;
param.Value = GetRandomPK(rnd, table);
com.Parameters.Add(param);
if (ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();
return(com);
}
/// <summary>
/// Utility method to test Async scenario using await keyword
/// </summary>
/// <returns></returns>
protected virtual async Task TestCommandAndReaderAsyncInternal()
{
Random rnd = RandomInstance;
using (DataStressConnection conn = Factory.CreateConnection(rnd))
{
if (!OpenConnection(conn))
{
return;
}
DataStressFactory.TableMetadata table = Factory.GetRandomTable(rnd);
DbCommand com;
com = Factory.GetInsertCommand(rnd, table, conn);
await CommandExecuteAsync(rnd, com, false);
com = Factory.GetDeleteCommand(rnd, table, conn);
await CommandExecuteAsync(rnd, com, false);
com = Factory.GetSelectCommand(rnd, table, conn);
await com.ExecuteScalarAsync();
com = Factory.GetSelectCommand(rnd, table, conn);
await CommandExecuteAsync(rnd, com, true);
}
}
/// <summary>
/// Returns a random command object
/// </summary>
public DbCommand GetCommand(Random rnd, TableMetadata table, DataStressConnection conn, bool query, bool isXml = false)
{
if (query)
{
return(GetSelectCommand(rnd, table, conn, isXml));
}
else
{
// make sure arguments are correct
DataStressErrors.Assert(!isXml, "wrong usage of GetCommand: cannot create command with FOR XML that is not query");
int select = rnd.Next(4);
switch (select)
{
case 0:
return(GetUpdateCommand(rnd, table, conn));
case 1:
return(GetInsertCommand(rnd, table, conn));
case 2:
return(GetDeleteCommand(rnd, table, conn));
default:
return(GetSelectCommand(rnd, table, conn));
}
}
}
/// <summary>
/// Returns a random existing Primary Key value
/// </summary>
private int GetRandomPK(Random rnd, TableMetadata table)
{
using (DataStressConnection conn = CreateConnection())
{
conn.Open();
// This technique to get a random row comes from http://www.4guysfromrolla.com/webtech/042606-1.shtml
// When you set rowcount and then select into a scalar value, then the query is optimised so that
// just the last value is selected. So if n = ROWCOUNT then the query returns the n'th row.
int rowNumber = rnd.Next(Depth);
DbCommand com = conn.CreateCommand();
string cmdText = string.Format(
@"SET ROWCOUNT {0};
DECLARE @PK INT;
SELECT @PK = PrimaryKey FROM {1} WITH(NOLOCK)
SELECT @PK", rowNumber, table.TableName);
com.CommandText = cmdText;
object result = com.ExecuteScalarSyncOrAsync(CancellationToken.None, rnd).Result;
if (result == DBNull.Value)
{
throw DataStressErrors.TestError(string.Format("Table {0} returned DBNull for primary key", table.TableName));
}
else
{
int primaryKey = (int)result;
return(primaryKey);
}
}
}
public void TestCommandTimeout()
{
Random rnd = RandomInstance;
DataStressConnection conn = null;
try
{
// Use a transaction 50% of the time
if (rnd.NextBool())
{
}
// Create a select command
conn = Factory.CreateConnection(rnd);
if (!OpenConnection(conn))
{
return;
}
DataStressFactory.TableMetadata table = Factory.GetRandomTable(rnd);
DbCommand com = Factory.GetSelectCommand(rnd, table, conn);
// Setup timeout. We want to see various possibilities of timeout happening before, after, or at the same time as when the result comes in.
int delay = rnd.Next(0, 10); // delay is from 0 to 9 seconds inclusive
int timeout = rnd.Next(1, 10); // timeout is from 1 to 9 seconds inclusive
com.CommandText += string.Format("; WAITFOR DELAY '00:00:0{0}'", delay);
com.CommandTimeout = timeout;
// Execute command and catch timeout exception
try
{
CommandExecute(rnd, com, true);
}
catch (DbException e)
{
if (e is SqlException && ((SqlException)e).Number == 3989)
{
throw DataStressErrors.ProductError("Timing issue between OnTimeout and ReadAsyncCallback results in SqlClient's packet parsing going out of sync", e);
}
else if (!e.Message.ToLower().Contains("timeout"))
{
throw;
}
}
}
finally
{
if (conn != null)
{
conn.Dispose();
}
}
}
public void TestCommandDelete()
{
Random rnd = RandomInstance;
using (DataStressConnection conn = Factory.CreateConnection(rnd))
{
if (!OpenConnection(conn))
{
return;
}
DataStressFactory.TableMetadata table = Factory.GetRandomTable(rnd);
DbCommand com = Factory.GetDeleteCommand(rnd, table, conn);
CommandExecute(rnd, com, false);
}
}
// method used to delete stress tables in the database
protected void CleanupUserTables(TableMetadata tableMetadata)
{
string DropTable = "drop TABLE " + tableMetadata.TableName + ";";
using (DataStressConnection conn = CreateConnection(null))
{
conn.Open();
using (DbCommand com = conn.CreateCommand())
{
try
{
com.CommandText = DropTable;
com.ExecuteNonQuery();
}
catch (Exception) { }
}
}
}
/// <summary>
/// Utility function used by MARS tests
/// </summary>
private void TestCommandMARS(Random rnd, bool query)
{
if (Source.Type != DataSourceType.SqlServer)
{
return; // skip for non-SQL Server databases
}
using (DataStressConnection conn = Factory.CreateConnection(rnd, DataStressFactory.ConnectionStringOptions.EnableMars))
{
if (!OpenConnection(conn))
{
return;
}
DbCommand[] commands = new DbCommand[rnd.Next(5, 10)];
List <Task> tasks = new List <Task>();
// Create commands
for (int i = 0; i < commands.Length; i++)
{
DataStressFactory.TableMetadata table = Factory.GetRandomTable(rnd);
commands[i] = Factory.GetCommand(rnd, table, conn, query);
}
try
{
// Execute commands
for (int i = 0; i < commands.Length; i++)
{
if (rnd.NextBool(0.7))
{
tasks.Add(CommandExecuteAsync(rnd, commands[i], query));
}
else
{
CommandExecute(rnd, commands[i], query);
}
}
}
finally
{
// All commands must be complete before closing the connection
AsyncUtils.WaitAll(tasks.ToArray());
}
}
}
private DbCommand CreateCommand(Random rnd, DataStressConnection conn)
{
DbCommand cmd;
if (conn == null)
{
cmd = DbFactory.CreateCommand();
}
else
{
cmd = conn.CreateCommand();
}
if (rnd != null)
{
cmd.CommandTimeout = rnd.NextBool() ? 30 : 600;
}
return(cmd);
}
protected bool OpenConnection(DataStressConnection conn)
{
try
{
conn.Open();
return(true);
}
catch (Exception e)
{
if (IsServerNotAccessibleException(e, conn.DbConnection.ConnectionString, conn.DbConnection.DataSource))
{
// Ignore this exception.
// This exception will fire when using named pipes with MultiSubnetFailover option set to true.
// MultiSubnetFailover=true only works with TCP/IP protocol and will result in exception when using with named pipes.
return(false);
}
else
{
throw e;
}
}
}
/// <summary>
/// Returns a random SELECT command
/// </summary>
public DbCommand GetSelectCommand(Random rnd, TableMetadata tableMetadata, DataStressConnection conn, bool isXml = false)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append(GetSelectCommandForMultipleRows(rnd, com, tableMetadata, isXml));
// 33% of the time, we also want to add another batch to the select command to allow for
// multiple result sets.
if ((!isXml) && (rnd.Next(0, 3) == 0))
{
cmdText.Append(";").Append(GetSelectCommandForScalarValue(com));
}
if ((!isXml) && ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();
return(com);
}
private DbCommand CreateCommand(Random rnd, DataStressConnection conn)
{
DbCommand cmd;
if (conn == null)
{
cmd = DbFactory.CreateCommand();
}
else
{
cmd = conn.CreateCommand();
}
if (rnd != null)
{
cmd.CommandTimeout = rnd.NextBool() ? 30 : 600;
}
return cmd;
}
/// <summary>
/// Returns a random command object
/// </summary>
public DbCommand GetCommand(Random rnd, TableMetadata table, DataStressConnection conn, bool query, bool isXml = false)
{
if (query)
{
return GetSelectCommand(rnd, table, conn, isXml);
}
else
{
// make sure arguments are correct
DataStressErrors.Assert(!isXml, "wrong usage of GetCommand: cannot create command with FOR XML that is not query");
int select = rnd.Next(4);
switch (select)
{
case 0:
return GetUpdateCommand(rnd, table, conn);
case 1:
return GetInsertCommand(rnd, table, conn);
case 2:
return GetDeleteCommand(rnd, table, conn);
default:
return GetSelectCommand(rnd, table, conn);
}
}
}
/// <summary>
/// Returns a random SELECT command
/// </summary>
public DbCommand GetSelectCommand(Random rnd, TableMetadata tableMetadata, DataStressConnection conn, bool isXml = false)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append(GetSelectCommandForMultipleRows(rnd, com, tableMetadata, isXml));
// 33% of the time, we also want to add another batch to the select command to allow for
// multiple result sets.
if ((!isXml) && (rnd.Next(0, 3) == 0))
{
cmdText.Append(";").Append(GetSelectCommandForScalarValue(com));
}
if ((!isXml) && ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();
return com;
}
// method used to create stress tables in the database
protected void BuildUserTables(List <TableMetadata> TableMetadataList)
{
string CreateTable1 =
"CREATE TABLE stress_test_table_1 (PrimaryKey int identity(1,1) primary key, int_FLD int, smallint_FLD smallint, real_FLD real, float_FLD float, decimal_FLD decimal(28,4), " +
"smallmoney_FLD smallmoney, bit_FLD bit, tinyint_FLD tinyint, uniqueidentifier_FLD uniqueidentifier, varbinary_FLD varbinary(756), binary_FLD binary(756), " +
"image_FLD image, varbinarymax_FLD varbinary(max), timestamp_FLD timestamp, char_FLD char(756), text_FLD text, varcharmax_FLD varchar(max), " +
"varchar_FLD varchar(756), nchar_FLD nchar(756), ntext_FLD ntext, nvarcharmax_FLD nvarchar(max), nvarchar_FLD nvarchar(756), datetime_FLD datetime, " +
"smalldatetime_FLD smalldatetime);" +
"CREATE UNIQUE INDEX stress_test_table_1 on stress_test_table_1 ( PrimaryKey );" +
"insert into stress_test_table_1(int_FLD, smallint_FLD, real_FLD, float_FLD, decimal_FLD, " +
"smallmoney_FLD, bit_FLD, tinyint_FLD, uniqueidentifier_FLD, varbinary_FLD, binary_FLD, " +
"image_FLD, varbinarymax_FLD, char_FLD, text_FLD, varcharmax_FLD, " +
"varchar_FLD, nchar_FLD, ntext_FLD, nvarcharmax_FLD, nvarchar_FLD, datetime_FLD, " +
"smalldatetime_FLD) values ( 0, 0, 0, 0, 0, $0, 0, 0, '00000000-0000-0000-0000-000000000000', " +
"0x00, 0x00, 0x00, 0x00, '0', '0', '0', '0', N'0', N'0', N'0', N'0', '01/11/2000 12:54:01', '01/11/2000 12:54:00' );"
;
string CreateTable2 =
"CREATE TABLE stress_test_table_2 (PrimaryKey int identity(1,1) primary key, bigint_FLD bigint, money_FLD money, numeric_FLD numeric, " +
"time_FLD time, date_FLD date, datetimeoffset_FLD datetimeoffset, sql_variant_FLD sql_variant, " +
"datetime2_FLD datetime2, xml_FLD xml);" +
"CREATE UNIQUE INDEX stress_test_table_2 on stress_test_table_2 ( PrimaryKey );" +
"insert into stress_test_table_2(bigint_FLD, money_FLD, numeric_FLD, " +
"time_FLD, date_FLD, datetimeoffset_FLD, sql_variant_FLD, " +
"datetime2_FLD, xml_FLD) values ( 0, $0, 0, '01/11/2015 12:54:01', '01/11/2015 12:54:01', '01/11/2000 12:54:01 -08:00', 0, '01/11/2000 12:54:01', '0' );"
;
if (TableMetadataList == null)
{
TableMetadataList = new List <TableMetadata>();
}
List <TableColumn> tableColumns1 = new List <TableColumn>();
tableColumns1.Add(new TableColumn("PrimaryKey", -1));
tableColumns1.Add(new TableColumn("int_FLD", -1));
tableColumns1.Add(new TableColumn("smallint_FLD", -1));
tableColumns1.Add(new TableColumn("real_FLD", -1));
tableColumns1.Add(new TableColumn("float_FLD", -1));
tableColumns1.Add(new TableColumn("decimal_FLD", -1));
tableColumns1.Add(new TableColumn("smallmoney_FLD", -1));
tableColumns1.Add(new TableColumn("bit_FLD", -1));
tableColumns1.Add(new TableColumn("tinyint_FLD", -1));
tableColumns1.Add(new TableColumn("uniqueidentifier_FLD", -1));
tableColumns1.Add(new TableColumn("varbinary_FLD", 756));
tableColumns1.Add(new TableColumn("binary_FLD", 756));
tableColumns1.Add(new TableColumn("image_FLD", -1));
tableColumns1.Add(new TableColumn("varbinarymax_FLD", -1));
tableColumns1.Add(new TableColumn("timestamp_FLD", -1));
tableColumns1.Add(new TableColumn("char_FLD", -1));
tableColumns1.Add(new TableColumn("text_FLD", -1));
tableColumns1.Add(new TableColumn("varcharmax_FLD", -1));
tableColumns1.Add(new TableColumn("varchar_FLD", 756));
tableColumns1.Add(new TableColumn("nchar_FLD", 756));
tableColumns1.Add(new TableColumn("ntext_FLD", -1));
tableColumns1.Add(new TableColumn("nvarcharmax_FLD", -1));
tableColumns1.Add(new TableColumn("nvarchar_FLD", 756));
tableColumns1.Add(new TableColumn("datetime_FLD", -1));
tableColumns1.Add(new TableColumn("smalldatetime_FLD", -1));
TableMetadata tableMeta1 = new TableMetadata("stress_test_table_1", tableColumns1);
TableMetadataList.Add(tableMeta1);
List <TableColumn> tableColumns2 = new List <TableColumn>();
tableColumns2.Add(new TableColumn("PrimaryKey", -1));
tableColumns2.Add(new TableColumn("bigint_FLD", -1));
tableColumns2.Add(new TableColumn("money_FLD", -1));
tableColumns2.Add(new TableColumn("numeric_FLD", -1));
tableColumns2.Add(new TableColumn("time_FLD", -1));
tableColumns2.Add(new TableColumn("date_FLD", -1));
tableColumns2.Add(new TableColumn("datetimeoffset_FLD", -1));
tableColumns2.Add(new TableColumn("sql_variant_FLD", -1));
tableColumns2.Add(new TableColumn("datetime2_FLD", -1));
tableColumns2.Add(new TableColumn("xml_FLD", -1));
TableMetadata tableMeta2 = new TableMetadata("stress_test_table_2", tableColumns2);
TableMetadataList.Add(tableMeta2);
using (DataStressConnection conn = CreateConnection(null))
{
conn.Open();
using (DbCommand com = conn.CreateCommand())
{
try
{
com.CommandText = CreateTable1;
com.ExecuteNonQuery();
}
catch (DbException de)
{
// This can be improved by doing a Drop Table if exists.
if (de.Message.Contains("There is already an object named \'" + tableMeta1.TableName + "\' in the database."))
{
CleanupUserTables(tableMeta1);
com.ExecuteNonQuery();
}
else
{
throw de;
}
}
try
{
com.CommandText = CreateTable2;
com.ExecuteNonQuery();
}
catch (DbException de)
{
// This can be improved by doing a Drop Table if exists in the query itself.
if (de.Message.Contains("There is already an object named \'" + tableMeta2.TableName + "\' in the database."))
{
CleanupUserTables(tableMeta2);
com.ExecuteNonQuery();
}
else
{
throw de;
}
}
for (int i = 0; i < Depth; i++)
{
TrackedRandom randomInstance = new TrackedRandom();
randomInstance.Mark();
DbCommand comInsert1 = GetInsertCommand(randomInstance, tableMeta1, conn);
comInsert1.ExecuteNonQuery();
DbCommand comInsert2 = GetInsertCommand(randomInstance, tableMeta2, conn);
comInsert2.ExecuteNonQuery();
}
}
}
}
/// <summary>
/// Returns a random INSERT command
/// </summary>
public DbCommand GetInsertCommand(Random rnd, TableMetadata table, DataStressConnection conn)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append("INSERT INTO \"");
cmdText.Append(table.TableName);
cmdText.Append("\" (");
StringBuilder valuesText = new StringBuilder();
valuesText.Append(") VALUES (");
List<TableColumn> columns = table.Columns;
int numColumns = rnd.Next(2, columns.Count);
bool mostlyNull = rnd.NextBool(0.1); // 10% of rows have 90% chance of each column being null, in order to test nbcrow
for (int i = 0; i < numColumns; i++)
{
if (columns[i].ColumnName.ToUpper() == "PRIMARYKEY") continue;
if (i > 1)
{
cmdText.Append(", ");
valuesText.Append(", ");
}
cmdText.Append(columns[i].ColumnName);
if (columns[i].ColumnName.ToUpper() == "TIMESTAMP_FLD")
{
valuesText.Append("DEFAULT"); // Cannot insert an explicit value in a timestamp field
}
else if (mostlyNull && rnd.NextBool(0.9))
{
valuesText.Append("NULL");
}
else
{
DbParameter param = CreateRandomParameter(rnd, string.Format("P{0}", i + 1), columns[i]);
valuesText.Append(param.ParameterName);
com.Parameters.Add(param);
}
}
// To deal databases that do not support auto-incremented columns (Oracle?)
// if (!columns["PrimaryKey"].AutoIncrement)
if (PrimaryKeyValueIsRequired)
{
DbParameter param = CreateRandomParameter(rnd, "P0", table.GetColumn("PrimaryKey"));
cmdText.Append(", PrimaryKey");
valuesText.Append(", ");
valuesText.Append(param.ParameterName);
com.Parameters.Add(param);
}
valuesText.Append(")");
cmdText.Append(valuesText);
if (ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();
return com;
}
/// <summary>
/// Returns a random INSERT command
/// </summary>
public DbCommand GetInsertCommand(Random rnd, TableMetadata table, DataStressConnection conn)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append("INSERT INTO \"");
cmdText.Append(table.TableName);
cmdText.Append("\" (");
StringBuilder valuesText = new StringBuilder();
valuesText.Append(") VALUES (");
List <TableColumn> columns = table.Columns;
int numColumns = rnd.Next(2, columns.Count);
bool mostlyNull = rnd.NextBool(0.1); // 10% of rows have 90% chance of each column being null, in order to test nbcrow
for (int i = 0; i < numColumns; i++)
{
if (columns[i].ColumnName.ToUpper() == "PRIMARYKEY")
{
continue;
}
if (i > 1)
{
cmdText.Append(", ");
valuesText.Append(", ");
}
cmdText.Append(columns[i].ColumnName);
if (columns[i].ColumnName.ToUpper() == "TIMESTAMP_FLD")
{
valuesText.Append("DEFAULT"); // Cannot insert an explicit value in a timestamp field
}
else if (mostlyNull && rnd.NextBool(0.9))
{
valuesText.Append("NULL");
}
else
{
DbParameter param = CreateRandomParameter(rnd, string.Format("P{0}", i + 1), columns[i]);
valuesText.Append(param.ParameterName);
com.Parameters.Add(param);
}
}
// To deal databases that do not support auto-incremented columns (Oracle?)
// if (!columns["PrimaryKey"].AutoIncrement)
if (PrimaryKeyValueIsRequired)
{
DbParameter param = CreateRandomParameter(rnd, "P0", table.GetColumn("PrimaryKey"));
cmdText.Append(", PrimaryKey");
valuesText.Append(", ");
valuesText.Append(param.ParameterName);
com.Parameters.Add(param);
}
valuesText.Append(")");
cmdText.Append(valuesText);
if (ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();
return(com);
}
/// <summary>
/// Returns a random UPDATE command
/// </summary>
public DbCommand GetUpdateCommand(Random rnd, TableMetadata table, DataStressConnection conn)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append("UPDATE \"");
cmdText.Append(table.TableName);
cmdText.Append("\" SET ");
List<TableColumn> columns = table.Columns;
int numColumns = rnd.Next(2, columns.Count);
bool mostlyNull = rnd.NextBool(0.1); // 10% of rows have 90% chance of each column being null, in order to test nbcrow
for (int i = 0; i < numColumns; i++)
{
if (columns[i].ColumnName == "PrimaryKey") continue;
if (columns[i].ColumnName.ToUpper() == "TIMESTAMP_FLD") continue;
if (i > 1) cmdText.Append(", ");
cmdText.Append(columns[i].ColumnName);
cmdText.Append(" = ");
if (mostlyNull && rnd.NextBool(0.9))
{
cmdText.Append("NULL");
}
else
{
DbParameter param = CreateRandomParameter(rnd, string.Format("P{0}", (i + 1)), columns[i]);
cmdText.Append(param.ParameterName);
com.Parameters.Add(param);
}
}
cmdText.Append(" WHERE PrimaryKey = ");
string pName = GetParameterName("P0");
cmdText.Append(pName);
DbParameter keyParam = DbFactory.CreateParameter();
keyParam.ParameterName = pName;
keyParam.Value = GetRandomPK(rnd, table);
com.Parameters.Add(keyParam);
if (ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString(); ;
return com;
}
/// <summary>
/// Returns a random UPDATE command
/// </summary>
public DbCommand GetUpdateCommand(Random rnd, TableMetadata table, DataStressConnection conn)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append("UPDATE \"");
cmdText.Append(table.TableName);
cmdText.Append("\" SET ");
List <TableColumn> columns = table.Columns;
int numColumns = rnd.Next(2, columns.Count);
bool mostlyNull = rnd.NextBool(0.1); // 10% of rows have 90% chance of each column being null, in order to test nbcrow
for (int i = 0; i < numColumns; i++)
{
if (columns[i].ColumnName == "PrimaryKey")
{
continue;
}
if (columns[i].ColumnName.ToUpper() == "TIMESTAMP_FLD")
{
continue;
}
if (i > 1)
{
cmdText.Append(", ");
}
cmdText.Append(columns[i].ColumnName);
cmdText.Append(" = ");
if (mostlyNull && rnd.NextBool(0.9))
{
cmdText.Append("NULL");
}
else
{
DbParameter param = CreateRandomParameter(rnd, string.Format("P{0}", (i + 1)), columns[i]);
cmdText.Append(param.ParameterName);
com.Parameters.Add(param);
}
}
cmdText.Append(" WHERE PrimaryKey = ");
string pName = GetParameterName("P0");
cmdText.Append(pName);
DbParameter keyParam = DbFactory.CreateParameter();
keyParam.ParameterName = pName;
keyParam.Value = GetRandomPK(rnd, table);
com.Parameters.Add(keyParam);
if (ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();;
return(com);
}
/// <summary>
/// Returns a random DELETE command
/// </summary>
public DbCommand GetDeleteCommand(Random rnd, TableMetadata table, DataStressConnection conn)
{
DbCommand com = CreateCommand(rnd, conn);
StringBuilder cmdText = new StringBuilder();
cmdText.Append("DELETE FROM \"");
List<TableColumn> columns = table.Columns;
string pName = GetParameterName("P0");
cmdText.Append(table.TableName);
cmdText.Append("\" WHERE PrimaryKey = ");
cmdText.Append(pName);
DbParameter param = DbFactory.CreateParameter();
param.ParameterName = pName;
param.Value = GetRandomPK(rnd, table);
com.Parameters.Add(param);
if (ShouldModifySession(rnd))
{
cmdText.Append(";").Append(GetRandomSessionModificationStatement(rnd));
}
com.CommandText = cmdText.ToString();
return com;
}
protected bool OpenConnection(DataStressConnection conn)
{
try
{
conn.Open();
return true;
}
catch (Exception e)
{
if (IsServerNotAccessibleException(e, conn.DbConnection.ConnectionString, conn.DbConnection.DataSource))
{
// Ignore this exception.
// This exception will fire when using named pipes with MultiSubnetFailover option set to true.
// MultiSubnetFailover=true only works with TCP/IP protocol and will result in exception when using with named pipes.
return false;
}
else
{
throw e;
}
}
}
